package com.eshop.frameworks.core.controller;

import java.awt.Color;
import java.awt.Font;
import java.awt.Graphics;
import java.awt.image.BufferedImage;
import java.io.IOException;
import java.util.Random;

import javax.imageio.ImageIO;
import javax.servlet.ServletOutputStream;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.RequestMapping;

import com.eshop.common.constant.CoreConstant;

/**
 * 
 * 
 * @description 验证码生成工具类
 * @author : spencer
 * @Create Date : 2013-12-13 下午2:38:55
 */
@Controller
public class RandomCodeController extends BaseController{

    /**
     * 
     * @param randomCodeName
     * @throws IOException
     */
    @RequestMapping("/ran/random")
    public void genericRandomCode(HttpServletRequest request, HttpServletResponse response)
            throws IOException {
        response.setContentType("image/jpeg");
        response.setHeader("Pragma", "No-cache");
        response.setHeader("Cache-Control", "no-cache");
        response.setDateHeader("Expires", 0);
        int width = 85, height = 28;

        BufferedImage image = new BufferedImage(width, height, BufferedImage.TYPE_INT_RGB);

        // 获取图形上下文
        Graphics g = image.getGraphics();

        // 生成随机类
        Random random = new Random();

        // 设定背景色
        g.setColor(new Color(124, 124, 124, 255));
        g.fillRect(0, 0, width, height);

        // 设定字体
        g.setFont(new Font("Times New Roman", Font.PLAIN, 27));

        // 随机产生155条干扰线，使图象中的认证码不易被其它程序探测到

        for (int i = 0; i < 155; i++) {
            int x = random.nextInt(width);
            int y = random.nextInt(height);
            int xl = random.nextInt(12);
            int yl = random.nextInt(12);
            g.drawLine(x, y, x + xl, y + yl);
        }

        // 取随机产生的认证码(4位数字)
        String sRand = "";
        for (int i = 0; i < 4; i++) {
            String rand = String.valueOf(random.nextInt(10));
            sRand += rand;
            // 将认证码显示到图象中
            Random random1 = new Random();
            int ri = random1.nextInt(4);
            if (0 == ri) {

                g.setColor(new Color(162, 162, 162, 255));
            }
            if (1 == ri) {
                g.setColor(new Color(56, 56, 56, 255));
            }
            if (2 == ri) {
                g.setColor(new Color(255, 255, 255, 255));
            }
            if (3 == ri) {
                g.setColor(new Color(56, 56, 56, 255));
            }
            // 调用函数出来的颜色相同，可能是因为种子太接近，所以只能直接生成
            g.drawString(rand, 16 * i + 10, 23);
        }

        this.setSessionAttribute(request, response,CoreConstant.RAND_CODE, sRand);
        // 图象生效
        g.dispose();

        ServletOutputStream responseOutputStream = response.getOutputStream(); // 输出图象到页面
        ImageIO.write(image, "JPEG", responseOutputStream);

        // 以下关闭输入流！ responseOutputStream.flush();
        responseOutputStream.close();
    }

    Color getRandColor(int fc, int bc) {
        // 给定范围获得随机颜色
        Random random = new Random();
        if (fc > 255)
            fc = 255;
        if (bc > 255)
            bc = 255;
        int r = fc + random.nextInt(bc - fc);
        int g = fc + random.nextInt(bc - fc);
        int b = fc + random.nextInt(bc - fc);
        return new Color(r, g, b);
    }

}
